just this week, police used the same no-wait procedures at the mall shooting in oregon. under the rules, when the shooter has been stopped, then the rescue begins. some of the sandy hook surviving children were led away in an organized line, each one grasping the shoulders of the child in front, their faces revealing both relief and fear. >> our main objective was to evacuate as quickly and efficiently as possible any and all students and fact you will any the school. >> reporter: this go-first tactic is now so ingrained in the police it's become standard training. but, scott, when police train they're told to expect this, that perhaps a mall, maybe even a high school. they do not expect to go to a grade school. >> pelley: wyatt, thank you. we'll have an update on the shooting in just a moment. you won't take my life. you won't take our future. aids affects us all. even babies. chevron is working to stop mother-to-child transmission. our employees and their families are part of the fight. and we're winning. at chevron nigeria, we haven't had a reported case in 12 years.